Question

8. Which giveS HULU
9. On which principle does the electric iron work?
19. How
the strength of magnetic field can be increased in an electromag​

Answer 1

Answer:

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Explanation:

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9. The electric iron was invented in 1882, by Henry W. Seeley. The basic principle on which the electric iron works is that when a current is passed through a piece of wire, the wire heats up. 

19. The strength of an electromagnet can be increased by increasing the number of loops of wire around the iron core and by increasing the current or voltage.